JP2009107229A - Thermally-discoloring writing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermally-discoloring writing implement capable of facilitating the storage of a plurality of writing implements, and capable of thermally easily discoloring a holograph of thermally-discoloring ink at a reduced load. <P>SOLUTION: A first writing body 2A has a pen tip 3A at one end, and stores the first thermally-discoloring ink inside. A second writing body 3B has a pen tip 3B at one end, and stores the second thermally-discoloring ink inside. A cap 4 has a first insertion attaching hole 4A capable of insertion-attaching the pen tip 3A side of the first writing body 2A, and a second insertion attaching hole 4B capable of insertion-attaching the pen tip 3B side of the second writing body 2B. The first insertion attaching hole 4A and the second insertion attaching hole 4B are formed in parallel with each other and opened along the same directions. A friction part 5 is formed on the outer face of the cap 4. The holograph caused by the first thermally-discoloring ink and the holograph caused by the second thermally-discoloring ink are rubbed by the friction part 5, and the respective holographs are thermally discolored by friction heat generated therein. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a thermochromic writing instrument. In detail, it is related with the thermochromic writing instrument which incorporated the thermochromic ink.

Conventionally, in a thermochromic writing instrument incorporating a thermochromic ink, Patent Document 1 discloses a configuration in which a friction body for thermally discoloring a handwriting by a thermochromic ink by frictional heat is provided on the top of the cap. The structure provided in the rear end is described.

JP 2004-148744 A

In order to obtain a plurality of handwriting (for example, handwriting of different pen tip types and ink colors), the conventional thermochromic writing tool requires a plurality of writing tools corresponding to the handwriting, and the total number of writing tools to be prepared increases. There is a risk of losing writing instruments during storage. Further, in the conventional thermochromic writing instrument, since the friction body is provided on the cap or the shaft cylinder of each writing instrument, when the friction body is used, the grip or the cylinder of each writing instrument is gripped. The force applied to the friction body may be increased.

The present invention solves the above-mentioned conventional problems, and it is easy to store a plurality of cursive materials, and thermochromic properties that can easily thermally discolor the handwriting of thermochromic ink with a small load. I want to provide a writing instrument.

1st invention of this application is a thermochromic writing instrument which incorporated thermochromic ink, Comprising: The 1st writing body 2A is equipped with the pen tip 3A at one end, and the 1st thermochromic ink is accommodated in the inside. The first thermochromic ink can be discharged from the nib 3A of the first writing body 2A, and the second writing body 2B has the nib 3B at one end and a second heat inside. The color changing ink is accommodated, and the second thermochromic ink is configured to be ejected from the pen tip 3B of the second writing body 2B, and the cap 4 is inserted into the pen tip 3A side of the first writing body 2A. A first insertion hole 4A that can be attached, and a second insertion hole 4B that can be attached to the pen tip 3B side of the second writing body 2B, and the first insertion hole 4A and the first insertion hole 4B. Two insertion holes 4B are provided in parallel to each other and opened in the same direction, and a friction portion 5 is provided on the outer surface of the cap 4, Each of the handwriting by the thermochromic ink of 1 and the handwriting by the second thermochromic ink are rubbed by the friction portion 5, and each of the handwriting can be discolored by frictional heat generated at that time. Item 1) is a requirement. (See FIGS. 1 to 6)

The thermochromic writing instrument 1 of the first invention can store a plurality of writing bodies together, and can prevent the loss of the writing bodies 2A and 2B. Further, the thermochromic writing instrument 1 of the first invention can increase the member (that is, the cap) to be gripped at the time of friction, and can easily discolor the handwriting of the thermochromic ink with a small load. Moreover, since the thermochromic writing instrument 1 according to the first invention does not require the friction portion 5 to be provided on each writing body, an increase in the number of parts can be suppressed.

The second invention of the present application is that, in the first invention, the entire cap 4 is formed of a material common to the friction portion 5 (Claim 2). (FIGS. 1 to 3)

In the thermochromic writing instrument 1 of the second invention, the entire cap 4 can be used as the friction portion 5, and the time for holding the cap 4 during friction is longer than in the configuration in which the friction portion 5 is provided in a part of the cap 4. Can be shortened.

According to a third invention of the present application, in the first invention, the cap 4 includes cap bodies 6, 6A, 6B each having a first insertion hole 4A and a second insertion hole 4B, and the cap body 6. , 6A, 6B and the friction part 5 fixed to the outer surface (Claim 3). (See FIGS. 4 to 6)

The thermochromic writing instrument 1 of the third invention has a first insertion hole 4A and a second insertion hole 4B that can be properly inserted into the first writing body 2A and the second writing body 2B. Can be easily formed. In the thermochromic writing instrument 1 according to the third aspect of the invention, for example, the friction portion 5 is formed integrally with the outer surface of the cap 4 by two-color molding, or the friction portion 5 made of a separate part from the cap 4. The structure which adheres to the outer surface of the cap 4 (for example, fitting, press-fit, screwing, adhesion, welding) is mentioned.

According to a fourth invention of the present application, in the first to third inventions, the color of the colored state of the first thermochromic ink is different from the color of the colored state of the second thermochromic ink ( Claim 4) is a requirement.

The thermochromic writing instrument 1 according to the fourth aspect of the present invention is a method in which two types of handwriting with different colors in the first thermochromic ink and the second thermochromic ink are drawn at once by frictional heat of the friction portion 5. Can be discolored by heat. Further, the thermochromic writing instrument 1 of the fourth invention has different color development states even when the handwriting of the first thermochromic ink and the handwriting of the second thermochromic ink overlap. The two types of handwriting can be identified.

According to a fifth invention of the present application, in the first to fourth inventions, the color change temperature due to frictional heat of the friction portion 5 of each of the first thermochromic ink and the second thermochromic ink is 25. It is a requirement that the temperature is set to from 95 ° C. to 95 ° C. (preferably from 36 ° C. to 90 ° C.).

The thermochromic writing instrument 1 of the fifth invention reliably heats two types of handwriting by the first thermochromic ink and the second thermochromic ink at a time by frictional heat generated by the friction part 5. Can be discolored. If any one of the color change temperature of the first thermochromic ink and the color change temperature of the second thermochromic ink is out of the above temperature range, the two types of handwriting are changed by the frictional heat of the friction part 5. There is a possibility that heat discoloration cannot be performed at once.

In the present invention, the friction part 5 is preferably made of a soft material. Examples of the soft material constituting the friction part 5 include resins having elasticity (rubber and elastomer), and examples thereof include silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-). Butadiene-styrene copolymer), fluororesin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM) and the like.

The soft material that constitutes the friction part 5 is more effective in that no debris is produced when it is made of a low-abrasion elastic material than a high-abrasion elastic material (for example, an eraser). .

The nib 3A of the first writing body 2A and the nib 3B of the second writing body 2B of the present invention are, for example, a ballpoint pen tip, a porous pen body (fiber processed body or porous bubble body), and an axial direction. Any of a pen body formed by extrusion molding of a synthetic resin having a capillary passage, a metal plate pen body having a slit at the tip, a brush pen body, and the like may be used.

The ball-point pen tip has a configuration in which a ball is rotatably held at the tip of the tip body. In addition, it is effective that the ballpoint pen tip is configured such that the ball is urged forward from the inside of the tip body by a projectile and the ball is pressed against the inner surface of the crimping portion (tip edge portion) of the tip body.

Examples of the porous pen body include a pen body made of a fiber processed body or a porous foam body. The porous pen body has a tip portion formed in a chisel shape or a shell shape.

-Thermochromic ink In the present invention, the thermochromic ink is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat decoloring type that decolors by heating from a colored state, a color memory retaining type that reversibly stores and retains a colored state or a decolored state in a specific temperature range, or from a decolored state Various types such as a heating coloring type that develops color by heating and returns to a decolored state by cooling from the colored state can be used alone or in combination.

The coloring material contained in the reversible thermochromic ink includes conventionally known (a) electron donating color-forming organic compounds, (b) electron-accepting compounds, and (c) color reactions of both. A reversible thermochromic microcapsule pigment in which a reversible thermochromic composition containing at least three essential components of a reaction medium for determining the occurrence temperature of the microcapsule is preferably used.

In the present invention, as shown in FIG. 7, the shape of the curve in which the change in color density due to temperature change is plotted, the temperature is raised from the lower temperature side than the color change temperature range, as opposed to the case where the temperature is raised from the lower temperature side than the color change temperature range. The color changes by following a different path depending on the descending state, and the color development state in the low temperature range below the complete color development temperature (t ₁ ) or the color erase state in the high temperature range above the complete color erase temperature (t ₄ ) It is preferable to apply a color memory retention type thermochromic ink that can be stored and retained in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase retention temperature range)]. In FIG. 7, ΔH indicates a temperature width (ie, hysteresis width) indicating the degree of hysteresis. When the value of ΔH is small, only one of the two states before and after the color change can exist. When the value of ΔH is large, it is easy to maintain each state before and after the color change.

In the present invention, the color change temperature due to frictional heat of the friction body of the thermochromic ink is set to 25 ° C. to 95 ° C. (preferably 36 ° C. to 95 ° C.). That is, in the present invention, the high temperature side discoloration point [complete decoloring temperature (t ₄ )] is set in a range of 25 ° C. to 95 ° C. (preferably 36 ° C. to 90 ° C.), and the low temperature side discoloration point [ It is effective to set the complete color development temperature (t ₁ )] in the range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). Accordingly, it is possible to effectively maintain the color exhibited in the normal state (daily life temperature range), and it is possible to easily change the color of the image or handwriting by the reversible thermochromic ink by the frictional heat generated by the friction body.

The reversible thermochromic microcapsule pigment preferably has an average particle diameter in the range of 0.5 to 5.0 μm, preferably 1 to 4 μm. When the average particle diameter exceeds 5.0 μm, the outflow from the capillary gap of the ballpoint pen tip or the porous pen body decreases, and when the average particle diameter is 0.5 μm or less, it is difficult to show high density color development. .

The reversible thermochromic microcapsule pigment can be blended in an amount of 2 to 50% by weight (preferably 3 to 40% by weight, more preferably 4 to 30% by weight) based on the total amount of the ink composition. If it is less than 2% by weight, the color density is insufficient, and if it exceeds 50% by weight, the ink outflow is reduced and the writing property is impaired.

According to the present invention, it is easy to store a plurality of writing materials, and the handwriting of the thermochromic ink can be easily discolored with a small load.

<First Embodiment>
A first embodiment of the thermochromic writing instrument 1 of the present invention is shown in FIGS.
The thermochromic writing instrument 1 according to the present embodiment is detachably inserted into a cap 4 having a first insertion hole 4A and a second insertion hole 4B, and the first insertion hole 4A of the cap 4. The first writing body 2A can be worn and the second writing body 2B can be detachably inserted into the second insertion hole 4B of the cap 4.

First cursive body The first cursive body 2A has a nib 3A at one end and contains a first thermochromic ink therein, and the first thermochromic ink is discharged from the nib 3A. Configured to be possible.

Second cursive body The second cursive body 2B has a nib 3B at one end and contains a second thermochromic ink therein, and the second thermochromic ink is discharged from the nib 3B. Configured to be possible.

First thermochromic ink The first thermochromic ink has a low temperature side discoloration point (complete color development temperature t ₁ ) set to an arbitrary temperature within a range of −30 ° C. to −10 ° C., and high temperature side color change. A reversible thermochromic ink in which the point (completely decoloring temperature t ₄ ) is set to an arbitrary temperature in the range of 60 ° C. to 80 ° C. and the hysteresis width ΔH is in the range of 40 ° C. to 60 ° C. is employed.

Second thermochromic ink The second thermochromic ink has a low temperature side discoloration point (complete color development temperature t ₁ ) set to an arbitrary temperature in the range of −30 ° C. to −10 ° C., and high temperature side color change. A reversible thermochromic ink in which the point (completely decoloring temperature t ₄ ) is set to an arbitrary temperature in the range of 60 ° C. to 80 ° C. and the hysteresis width ΔH is in the range of 40 ° C. to 60 ° C. is employed.

Note that the color of the colored state of the first thermochromic ink is different from the color of the colored state of the second thermochromic ink.

The cap cap 4 is entirely formed of a soft material (for example, SBS resin, SEBS resin), and a friction portion 5 is formed on the outer surface of the cap 4 as a whole. The cap 4 is provided with a first insertion hole 4A and a second insertion hole 4B in parallel with each other. One end of the first insertion hole 4A and one end of the second insertion hole 4B are opened in the same direction, and the other end of the first insertion hole 4A and the other end of the second insertion hole 4B are Closed.

The cap 4 has a rectangular parallelepiped shape. Thereby, an area for gripping the outer surface of the cap 4 at the time of friction is increased, a stable friction operation is possible, and it is not bulky when not in use and is convenient for carrying. In the present invention, the shape of the cap 4 may be any other shape such as a cylinder, a polygonal column, a sphere, a hemisphere, or a shape imitating an arbitrary figure.

Although not shown, in the first embodiment, a first small cap is detachably attached to the first pen tip 3A side of the first writing body 2A, and the first small cap is attached. The pen tip 3A side (second small cap) of the first cursive body 2A can be detachably attached to the first insertion hole 4A of the cap 4 in a state of being mounted on the pen tip 3A side of the first cursive body 2A. It may be inserted.

Similarly, although not shown, in the first embodiment, a second small cap is detachably attached to the second pen tip 3B side of the second writing body 2B, and the second small cap is attached. Is attached to the pen tip 3B side of the second cursive body 2B, and the pen tip 3B side (first small cap) of the second cursive body 2B is detachable in the second insertion hole 4B of the cap 4. It may be inserted into.

<Second Embodiment>
A second embodiment of the thermochromic writing instrument 1 of the present invention is shown in FIG.
In the thermochromic writing instrument 1 according to the present embodiment, the cap 4 has a cap body 6 having a first insertion hole 4A and a second insertion hole 4B, and friction that is fixed to the outer surface of the cap body 6. Part 5. The friction part 5 is made of a soft material (for example, SBS resin, SEBS resin), and the cap body 6 is harder than the friction part 5 (for example, synthetic resin such as polycarbonate, polypropylene, polyethylene terephthalate). Consists of. The friction portion 5 is fixed to the closed side of the first insertion hole 4 </ b> A and the second insertion hole 4 </ b> B of the cap body 6. The friction part 5 is fixed to the cap body 6 by fitting, press-fitting, screwing, adhesion, welding, or two-color molding on the outer surface.

Note that the first and second writing bodies 2A and 2B used in the present embodiment are the same as those in the first embodiment, and a description thereof will be omitted.

<Third Embodiment>
3rd Embodiment of the thermochromic writing instrument 1 of this invention is shown in FIG.5 and FIG.6.
In the thermochromic writing instrument 1 of the present embodiment, the cap 4 has two cylindrical cap bodies 6A and 6B each of which constitutes the first insertion hole 4A and the second insertion hole 4B, and the two It consists of the friction part 5 fixed to the outer surface of cap main body 6A, 6B. Each of the cap bodies 6A and 6B is made of a material harder than the friction portion 5 (for example, synthetic resin such as polycarbonate, polypropylene, polyethylene terephthalate). The cap bodies 6A and 6B are fixed to the inner surfaces of the mounting holes 5A and 5B of the friction portion 5 by fitting, press-fitting, screwing, adhesion, welding, or two-color molding.

The friction part 5 is made of a soft material (for example, SBS resin, SEBS resin) and has a rectangular parallelepiped shape. Two attachment holes 5A and 5B are formed in the friction portion 5. The cap bodies 6A and 6B are accommodated and fixed in the two mounting holes 5A.

It is a principal part longitudinal cross-sectional view of the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the cap of FIG. FIG. 3 is an end view taken along line AA in FIG. 2. It is a longitudinal cross-sectional view of the cap of the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the cap of the 3rd Embodiment of this invention. FIG. 6 is an end view taken along line BB in FIG. 5. It is explanatory drawing which shows the discoloration behavior of a reversible thermochromic composition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thermochromic writing tool 2A 1st writing body 2B 2nd writing body 3A Pen tip 3B Pen tip 4 Cap 4A 1st insertion hole 4B 2nd insertion hole 5 Friction part 5A Attachment hole 5B Attachment hole 6 Cap Body 6A Cap body 6B Cap body

Claims (5)

A thermochromic writing instrument with a built-in thermochromic ink,
The first cursive body is provided with a nib at one end and contains the first thermochromic ink therein, and the first thermochromic ink can be discharged from the nib of the first cursive body. ,
The second cursive body is provided with a nib at one end and the second thermochromic ink is accommodated therein, and the second thermochromic ink can be discharged from the nib of the second cursive body. ,
The cap includes a first insertion hole into which the pen tip side of the first cursive body can be inserted, and a second insertion hole into which the pen tip side of the second cursive body can be inserted,
The first insertion hole and the second insertion hole are provided in parallel with each other and opened in the same direction,
A friction part is provided on the outer surface of the cap,
Each of the handwriting by the first thermochromic ink and the handwriting by the second thermochromic ink is rubbed by the friction portion, and each of the handwriting can be thermally discolored by frictional heat generated at that time. Characteristic thermochromic writing instrument. The thermochromic writing instrument according to claim 1, wherein the entire cap is formed of a material common to the friction portion. 2. The thermochromic writing instrument according to claim 1, wherein the cap includes a cap body having a first insertion hole and a second insertion hole, and a friction portion fixed to an outer surface of the cap body. The thermochromic writing instrument according to any one of claims 1 to 3, wherein a color of the colored state of the first thermochromic ink and a color of the colored state of the second thermochromic ink are different. The heat according to any one of claims 1 to 4, wherein each of the first thermochromic ink and the second thermochromic ink has a discoloration temperature of 25 ° C to 95 ° C due to frictional heat of the friction part. Discoloring writing instrument.

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